U.S., Other World Powers Want to Extend Talks

VIENNA—The U.S. and other world powers said it will be virtually impossible to reach a comprehensive deal to curb Iran’s nuclear activities by the Monday night deadline, and they would favor extending the talks.

U.S. officials are arguing that preserving improved relations with Tehran is preferable to a breakdown in more than a year of direct negotiations and a potential escalation of tensions in an already-fractious Middle East.